MINIMUM POPULATIONS FOR WARM-SEASON CROPS

 

Some problems have been reported with plant densities of warm-season crops due to soil insects, salt-affected soils, etc. As a general guideline, the following table lists the minimum stand for selected crops.

 

Crop

% of normal stand

minimum stand (plants/A)

Soybean - 30-inch rows

25 to 50

37,500 to 75,000

Soybean - solid seeded

25 to 50

50,000 to 100,000

Sunflower - oilseed

50 to 60

10,000 to 14,000

Sunflower - confection

50 to 60

8,000 to 11,000

Dry bean - navy

50 to 60

45,000 to 60,000

Dry bean - pinto

40 to 50

28,000 to 35,000

Corn - dryland

60 to 70

-

Corn - irrigated

70 to 75

-

Buckwheat

30 to 40

240,000 – 320,000

 

Refer to NDSU Extension Service circular A934 ‘Replanting after early-season crop injury’ for details including replant considerations.

 

 

LATE APPLICATION OF POST BROADLEAF HERBICIDES IN WHEAT

 

The following is a listing of the maximum wheat stage for application of POST broadleaf weed herbicides for use in wheat at the jointing stage and beyond. Keep in mind that grain yield loss likely has occurred in advanced stages of wheat if sufficient weed populations have been present since crop establishment. An option to a late POST herbicide application would be use of a pre-harvest treatment.

 

Herbicide

Maximum wheat stage for herbicide application

Peak

until second node is detectable

Canvas

prior to flag leaf emergence

Express

 

Finesse

 

Harmony Extra or GT

 

Starane

through flag leaf emergence

Ally

prior to boot

Amber

 

Bromoxynil

 

MCPA amine or ester

 

2,4-D amine or ester

 

 

 

 

Refer to herbicide labels and NDSU Extension Service circular W-253 ‘2000 ND Weed Control Guide’ for details.